Improvement in safety-plug attachments to steam-boilers



N.PETERS. PHOTO-LITHOGRAPMER. WASHINGTON. D C.

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@time @time A' o all (whom /itl'm 1) cm ehusetts, and J QHN OQGHAIWAN,of Gembrhlgeport, in the county and@ State aforesaid, have invented `unp fulhfcleallyiend exact description, reference being hed "gmakngpertothisspeciy asidefelcvationof ourfappm'otus. f

Figure 2 is eliseeti through aportionofasteztm-`lloilerllutving.ournppe` Musipplied thereto. 'lheivaterinQfsteum-boilers is, frequently, through fel .low 'the desired, level,ieets to becomeoverted `state tlieyynre liable p ntaLet ofthe waterwhich lsgpunipedih" ltoyl'esu'ppl` he boiler. After thishus been41repeal-ted"ai. "umher of'times ythe bersof. theirou .becomeweakenediandtthe `strength of the` crown und 'luefsh'eetsfpis tlfus'seriouslyiinpaiired, so that, after l been weakened from thiscnnse, antimesoccur, even when tliejirebox or furnace, the v ipe `beingclosedbya. plugor ydiskot fusible itilloy, y yill nieltata giventemanditliepipefib gfqconnected with un` euxp pefconiinuuic. 'ngiwithsupply of waiter, `whereby,when`tl1e`watt heboiler descends belowheldesired level, steil,` dmitted to the pipe und heiiisible plug meltedwhenf thefwuterl is forced through Ithe 'pipe "into" th rbox' or furnaceand the tingnished,"whiclrtlr ",etfectually prevents `the pmge trough`this uled, its lieretoiorfbypuinpihg. water into the boiler. yTolenblefothers skilledm inwthfe art to undersntnd 4nd useburinventiomlw l proceed to describejthe `ann`e"`ninlwhieh we her ieditout. i

thesnid drawingi- E f "I Ai representslflsteai @,{theflee which he alpipel is closedl by a; plug l1 fuse `on steen:` comingIville`,;1`in"thehcounty ofgMid'dlesiex Itud Stute'fof Mussel"utoinittie` Appal,rattilsfor` Extinguishing the A Eire i iu`Stealnoiler:Eux-nocesl when `the wutcr in` the boiler?-'faillslbelowthe desired level,of which the `ibllonrin'gs.`

` theobjeet of our ists in pipe lending freine point t-"would not besttieyforv ter` should Staind within ru; `would not be sfe for-the'`Thngnthef que, `ofrivi with' um lmet, pit- 1870. l

1B, 5 which extends down? "Southmost, AND'JOHN c. CHAPMAN, or oAMRiDGE-Pom, MASSACHUSETTS:

auxiliary pipe, D, which extends down und enters the -boilrztta-pohitwbich will insure its boing ulwztys in 'communication with a,supply of witter.

When the water is atits proper level within the boilerit is prevented,by the plug c, from passing through the pipe B to the fire-box; butshould the walter be allowed, through carelessness, todescend "below thelerel'ofthe end 5 ot'. the pipe B, the steum will'enter thisrpipe andmelt the plug c, whenlt-he water from the boiler will be forced upthrough the pipe'D into the pipe B, by reason of the pressure of thesteam'upon the body of thelwuter inthe boiler being greaterthun thepressure of the ste'zunpussing v through the pipe vByttnd aided,`.too,by the pussing steam creittinga. partiel vzicunm above the niouthot thepipe-D, andthencethrough the pipe B into the fire-box or furnace' C,tliis immediately extinguishing the iire, and notifying thelpersen inchui-ge that tile*` water has descended below its properflevel.

The above-described automatic appurutus is beyond' the control of theengineer, and the owner of a. boiler can 4thus feel assured tliatthe'rewill be no liability of its'exploding or becoming injured through theneglect ,or carelessness of the'engineer or person 1n ehm-ge, us,"ontheeventof the water being allowed to descend y below the properlevel, it will be inpos'sible'n' theexposed yportions of the boiler tobecome overheuted, u.; the fire will be extinguished before this cnnoccur, und

consequently no 4dumttge cain result from the pumping f iu oflwater `toresupply the boiler, us hns frequently` beentbe ense heretofore.

Instead of the auxiliary pipeD communicuting with vthe interior of theboiler, it may conununicute with zt tank or supply of. water outside theboiler; but this:` .auxiliary pipe must connect with the pipe B atsoniej y point between its extremity 5 and the fusible lplug c, whichmuy be placed ut any .desiredV pointV within the y l `Viiutt we claim asourinveution, und desire to secure by Letters Pgttent, is-

:The pipe B, 'leading `from the interior offthe boiler i ANDREW ROBES.`JOHN G CrL-XPMAN;

` `Witnesses:

- P. E.'1usoHn;mcnER,

Y L, E. BATcHuLLER.

Connected witlvfthe pipe B, outside `the boiler, is :m

